Since RUNTIME-650, CSS is inlined when sending a mail with SendMailHelper. Extract:

String[] selector = selectors.split(",");
for (String s : selector)
{
	if (StringUtils.isNotEmpty(s) && !s.contains(":"))
	{
		Elements selectedElements = doc.select(s); 
		for (Element selElem : selectedElements) 
		{ 
			String oldProperties = selElem.attr("style"); 
			selElem.attr("style", oldProperties.length() > 0 ? concatenateProperties(oldProperties, properties) : properties); 
		} 
		
	}
}

Instead of testing if the selector is not empty, we should test if it's not blank
Additionally, the doc.select(s) statement can throw RuntimeExceptions. We should either:

• throw Exception specifically in SendMailHelper functions to enforce the callers catch these exceptions
• explain this in the javadoc
• catch RuntimeException in the block and ignore it or copy the css "as-is".